Vinyl azides in heterocyclic synthesis. Part 6. Synthesis of isoquinolines by intramolecular aza-Wittig reaction
作者:Deirdre M. B. Hickey、A. Roderick MacKenzie、Christopher J. Moody、Charles W. Rees
DOI:10.1039/p19870000921
日期:——
Azidocinnamates containing ortho-carbonyl substituents are versatile intermediates for heterocyclic synthesis. Isoquinolines (8) and (9) are formed under mild neutral conditions by intramolecular aza-Wittig reactions of iminophosphoranes, readily derived from azides (1) and (2), respectively, with triethyl phosphite. The azafluoranthene (10) can also be prepared from the azide (3)via the isolable iminophosphoranes
含有邻-羰基取代基的叠氮肉桂酸酯是用于杂环合成的通用中间体。异喹啉(8)和(9)在中等中性条件下通过亚氨基三磷酸亚氨基的分子内aza-Wittig反应形成,亚氨基三氢呋喃分别易于从叠氮化物(1)和(2)衍生而来。氮杂荧蒽(10)也可以通过可分离的亚氨基正膦(11)和(12)由叠氮化物(3)制备。叠氮化物(1)在甲苯或二甲苯中的热解产生了4-取代的吲哚(13)的产量(表2)。类似地,吲哚(14)和(19)分别由叠氮化物(3)和(6a和b)形成。